Britvic has posted a 2.1% increase in total sales to £218.6m for the 12 weeks to 21 December.
Sales in the soft drink manufacturer's Great Britain and International division rose 3.8% during the period but sales in Britvic Ireland, which last week announced 145 job losses, dropped 2.9%.
In Great Britain, growth was driven by value and volume share gains from Robinsons and the "continued success" of Gatorade and Drench, said chairman Gerald Corbett.
"Through 2009 we anticipate the GB soft drinks market will remain relatively resilient and the Ireland market particularly challenging," he added.
"We are taking strong management action on costs and forecast a further 1% reduction in raw material inflation to 4%-4.5% in 2009, completing the underpinning of the exceptionally challenging trading conditions in Ireland."